CN102546662B - Method and device for branching call under gateway mode - Google Patents
Method and device for branching call under gateway mode Download PDFInfo
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- CN102546662B CN102546662B CN201210043321.0A CN201210043321A CN102546662B CN 102546662 B CN102546662 B CN 102546662B CN 201210043321 A CN201210043321 A CN 201210043321A CN 102546662 B CN102546662 B CN 102546662B
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Abstract
The invention provides a method and device for branching a call under a gateway mode. The method comprises the following steps: any early-stage media negotiation with any user agency server UAS in a branched call is finished by a user agency client UAC; if another UAS is selected as an early-stage media sending party, any UAS is notified to stop sending early-stage media and keep attributes of the media unchanged; after receiving the notification sent by the UAC, the any UAS stops sending the early-stage media and keeps attributes of the media unchanged according to the notification. According to the method and the device provided by the invention, conventional media can be prevented from being deleted under the condition that the call is branched in a gateway mode.
Description
Technical field
The present invention relates to communication technical field, particularly a kind of method and apparatus of branching call under gateway mode.
Background technology
The object of calling out in the telephone network is to set up call between calling subscriber and called subscriber, the media that call is transmitted between calling subscriber and called subscriber before setting up are Early media, such as ring-back tone, CRBT etc., the media that call is transmitted between calling subscriber and called subscriber after setting up are Conventional media.
Transmit Early media, need between calling subscriber and called subscriber, to carry out early media negotiation, set up media session.In order to realize conversation initialized protocol (Session Initiation Protocol, SIP) transmission of Early media in session, RFC3960 proposes the gateway mode and the application server pattern that are used for early media negotiation, the realization of gateway mode is comparatively simple, and current most telephone system all adopts gateway mode to consult Early media.
See the interaction diagrams that Fig. 1, Fig. 1 are early media negotiations under gateway mode, comprise the following steps:
Step 101, User Agent Client (UAC, also be the sip terminal of calling subscriber) to User Agent Server (UAS, also be the sip terminal of called subscriber) send call request (INVITE), carry the offer with media negotiation;
Step 102, UAS reply 183 interim reliable response, carry and consult successful Early media answer;
Step 103, UAC send PRACK to UAS and confirm 183 interim reliable response;
Step 104, UAS reply 200OK and confirm, complete the early media negotiation with UAC, set up early-session.
Step 105, UAS send Early media to UAC;
Step 106, UAS off-hook answering call, reply 200OK response, and stop sending Early media;
Step 107, UAC send ACK to UAS and set up calling, are switched to conventional session from early-session;
The mutual Conventional media of step 108, UAC and UAS, realizes double-talk.
Gateway mode uses simple interaction flow to complete the negotiations process of Early media, is used widely.But gateway mode well cannot process bifurcation call, is described below in conjunction with Fig. 2:
Fig. 2 is the process chart of branching call under gateway mode, comprises the following steps:
Step 201, UAC send call request INVITE to UAS1 and UAS2 simultaneously.
Step 202-205, UAS1 and UAC complete early media negotiation, send Early media to UAC.Negotiations process is identical with the step 102-105 in Fig. 1.
Step 206-208, UAS2 and UAC complete early media negotiation; Negotiations process is identical with the step 102-104 in Fig. 1.
Step 209, UAC have selected UAS1 as Early media broadcasting side, receive the Early media from UAS1, and it is quiet for therefore arranging UAS2 to UAS2 transmission UPDATE (MUTE) request.
It is corresponding that step 210, UAS2 reply 200OK, and ask the medium property arranging self to be quiet according to the UPDATE (MUTE) of UAC.
Step 211, t1 moment UAS2 off-hook, send 200OK response to UAC, called subscriber starts speech; Medium property due to self is set to quiet, and USA2 can not send the Media Stream (also i.e. called subscriber talk the Conventional media produced) of called subscriber's speech to UAC.
Step 212-213, UAC send CANCLE to UAS1 and cancel calling, and send ACK foundation calling to UAS2.
Step 214, UAC send UPDATE (UN MUTE) request to UAS2 and cancel the quiet of UAS2.
Step 215, UAS2 reply 200OK and confirm, and according to the UPDATE (UN MUTE) of UAC request cancel quiet, complete media re-negotiation (t2 moment).
Step 216, complete media re-negotiation after, the mutual Conventional media of UAS2 and UAC.
In the process of above-mentioned process bifurcation call, because the state of t1 moment (called off-hook starts the moment of talking) to t2 moment (the UAS2 quiet moment of heavily having consulted is cancelled in UAC request) UAS2 is quiet (inactive), any Media Stream can not be sent to UAC, cause the Media Stream of called subscriber's speech in the t1-t2 time to be lost.Visible, in the realization of existing gateway pattern lower bifurcation calling, delete the problem of cutting, the beginning loss of voice of talking after causing called subscriber's off-hook from having Conventional media after Early media is switched to Conventional media.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of method and apparatus of branching call under gateway mode, the method can be avoided Conventional media in bifurcation call situation to be deleted cutting.
In order to achieve the above object, a kind of method avoiding media to delete after calling out bifurcated under the invention provides gateway mode cutting, the method comprises:
User Agent Client UAC complete with the early media negotiation of arbitrary subscriber proxy server UAS in bifurcation call after, if selected other UAS as Early media transmit leg, then notify that described arbitrary UAS stops sending Early media and keeping medium property constant;
Described arbitrary UAS receives the described notice that described UAC sends, then stop sending Early media and keeping the medium property of self constant according to described notice.
Present invention also offers a kind of UAC, this UAC comprises: early media negotiation unit, Early media selected cell, Early media receiving element;
Described early media negotiation unit, for completing the early media negotiation with arbitrary subscriber proxy server UAS in bifurcation call;
Described Early media selected cell, for media negotiation unit in early days complete with the early media negotiation of UAS arbitrary described in bifurcation call after, if selected other UAS as Early media transmit leg, then notify that described arbitrary UAS stops sending Early media and keeping medium property constant.
Present invention also offers a kind of UAS, this UAS comprises: early media negotiation unit, notice receiving element, Early media transmitting element;
Described early media negotiation unit, for completing the early media negotiation with User Agent Client UAC;
Described notice receiving element, for media negotiation unit in early days complete with the early media negotiation of described UAC after, if the stopping receiving described UAC sends Early media and the notice keeping medium property constant, then notify that Early media transmitting element stops sending Early media, and keep the medium property of self constant.
From technical scheme above, in the present invention, UAC complete with the early media negotiation of the arbitrary UAS in bifurcation call after, when selecting other UAS as Early media transmit leg, notify that this UAS stops sending Early media keep medium property constant.Like this, this UAS stops sending Early media and keeping the medium property of self constant according to the notice of UAC, because medium property does not change, can send Conventional media at once after going off-hook, therefore, it is possible to Conventional media is deleted and cut under avoiding bifurcation call situation.
Accompanying drawing explanation
Fig. 1 is the interaction diagrams of early media negotiation under prior art gateway mode;
Fig. 2 is the process chart of prior art branching call under gateway mode;
Fig. 3 is the method flow diagram of embodiment of the present invention branching call under gateway mode;
Fig. 4 is the exemplary process diagram that shown in application drawing 3, the embodiment of the present invention carries out bifurcation call;
Fig. 5 is the structural representation of embodiment of the present invention UAC;
Fig. 6 is the structural representation of embodiment of the present invention UAS.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, to develop simultaneously embodiment below in conjunction with accompanying drawing, technical scheme of the present invention is described in detail.
See the method flow diagram that Fig. 3, Fig. 3 are embodiment of the present invention branching call under gateway modes, comprise the following steps:
Step 301, UAC complete with the early media negotiation of arbitrary UAS in bifurcation call after, if selected other UAS as Early media transmit leg, then notified that described arbitrary UAS stops sending Early media and keeping medium property constant.
Step 302, described arbitrary UAS receive the described notice that described UAC sends, then stop sending Early media and keeping the medium property of self constant according to described notice.
In the embodiment of the present invention shown in Fig. 3, after UAS off-hook, Conventional media is deleted and is cut, after UAC and certain UAS completes early media negotiation, have selected Early media transmit leg if current, then needed to notify that this UAS stops sending Early media and keeping medium property constant; If this UAS receives the described notice of UAC, then stop sending Early media to UAC, and keep the medium property of self constant.Like this, when after this UAS off-hook, because the medium property of this UAS self does not change, therefore also can get started transmission Conventional media, avoid Conventional media and deleted and cut.
In fact, if UAC is after completing early media negotiation with this UAS, if not yet select Early media transmit leg, then this UAS also can be selected as Early media transmit leg.Like this, if this UAS off-hook, then because this UAS is Early media transmit leg, can get started and send Conventional media to UAC, therefore Conventional media also can not be deleted and be cut.
Therefore, in step 301, described UAC complete with the early media negotiation of UAS arbitrary described in bifurcation call after, comprise further: if not yet select media transmit leg in the early time, then select described arbitrary UAS as Early media transmit leg, receive the Early media sent from described arbitrary UAS;
Correspondingly, if described arbitrary UAS does not receive the described notice that described UAC sends, then illustrate that UAC selects oneself as Early media transmit leg, therefore sends Early media to described UAC.
Select Early media transmit leg can adopt multiple choices rule, such as, first UAS completing early media negotiation can be selected as Early media transmit leg, select last UAS completing early media negotiation as Early media transmit leg, or any one in the middle of selecting completes the UAS of early media negotiation as Early media transmit leg.
In practical application, the sender-selected rule of Early media can be preset according to specific needs, selected early media negotiation and the UAS meeting the sender-selected rule of default Early media as Early media transmit leg.Therefore, after UAC determines not yet to select Early media transmit leg, select described arbitrary UAS as before Early media transmit leg, can further include: judge whether described arbitrary UAS meets the sender-selected rule of default Early media, if so, then select described arbitrary UAS as Early media transmit leg, otherwise, notify that described arbitrary UAS stops sending Early media and keeping medium property constant, after making described arbitrary UAS off-hook, send Conventional media.
In the embodiment of the present invention shown in Fig. 3, UAC complete with the early media negotiation of UAS arbitrary described in bifurcation call after, one or many media re-negotiation can also be carried out with described arbitrary UAS, such as, carry out the negotiation etc. of encoding and decoding.
Renewal (UPDATE) can be used to ask to send to described arbitrary UAS to stop sending Early media and the notice keeping medium property constant.When using UPDATE request, do not change to keep the medium property of described arbitrary UAS, the successful Session Description Protocol of current negotiation (SDP) information is carried in UPDATE request, if do not carry out media re-negotiation after UAC and described arbitrary UAC completes early media negotiation, then the successful SDP information of current negotiation consults successful SDP information in media consultation process in early days, if carry out media re-negotiation after UAC and described arbitrary UAC completes early media negotiation, then the successful SDP information of current negotiation is the last SDP information of heavily consulting.Therefore, UAC notifies that described arbitrary UAS stops sending Early media and the method keeping medium property constant is specifically as follows: send to described arbitrary UAS and carry stopping transmission Early media mark and ask with the UPDATE of the successful SDP information of described arbitrary UAS current negotiation.
In described UPDATE request, carry the method stopping sending Early media mark can have multiple, such as, a new Session initiation protocol SIP header field can be increased in described UPDATE request: Content-Disposition:early-session-inative.Like this, UAS, after completing early media negotiation with UAC, if receive the UPDATE request of carrying this SIP head territory, then can stop sending Early media to UAC.
When adopting above-mentioned SIP head territory to send media flag as stopping, being exemplified below of the form that UPDATE asks:
Content-Type:application/sdp
Content-Disposition:early-session-inactive
v＝0
o＝alice 2890844717 2890844717IN IP4host.example.com
s＝
c＝IN IP4 192.0.2.1
t＝00
m＝audio 20002RTP/AVP 0
Below in conjunction with Fig. 4, the application of the method for embodiment of the present invention branching call under gateway mode is illustrated.
Fig. 4 is the exemplary process diagram that shown in application drawing 3, the embodiment of the present invention carries out bifurcation call, and Fig. 4, based on Fig. 2, comprises the following steps:
Step 401, UAC send call request INVITE to UAS1 and UAS2 simultaneously.
Step 402-405, UAS1 and UAC complete early media negotiation, send Early media to UAC.Negotiations process is identical with the step 102-105 in Fig. 1.In the process, UAC selects UAS1 as Early media transmit leg, receives the Early media that UAS1 sends.
Step 406-408, UAS2 and UAC complete early media negotiation; Negotiations process is identical with the step 102-104 in Fig. 1.
Step 409, UAC have selected UAS1 as Early media transmit leg, therefore send the UPDATE request of carrying and stopping sending Early media mark and consulting successful SDP information to UAS2 immediately after completing early media negotiation, notice UAS2 stops playing Early media and keeping medium property constant.
Step 410, UAS2 reply 200OK and confirm after receiving the UPDATE request of UAC, stop playing Early media, and keep medium property constant, so that can ensure after UAS2 off-hook can the mutual Conventional media with UAC at once.
Step 411, UAS2 off-hook, 200OK response is replied to UAC, medium property due to UAS2 has still kept the state during early media negotiation with UAC, be not set to quiet, UAS2 can send Conventional media (Media Stream of also i.e. called speech) to UAC, and Conventional media can not be deleted and cut.
Step 412-413, UAC send CANCEL to UAS1 and cancel calling, and send ACK foundation calling to UAS2.
The mutual Conventional media of step 414, UAC and UAS, realizes call.
As can be seen from above-mentioned bifurcation call process, UAS2 is after completing the early media negotiation with UAC, because the stopping receiving UAC sends Early media and the notice keeping medium property constant, therefore stop sending Early media to UAC, and keep the medium property of self constant, thus do not need after going off-hook heavily to consult flow process with UAC again, but the Media Stream of called subscriber can be sent at once to UAC, and be not set to quiet due to the medium property of UAS2 self, therefore the Media Stream of called subscriber can be received by calling subscriber, can not be deleted and cut.
The method realizing calling bifurcated under being used for gateway mode to the embodiment of the present invention has above been described in detail, and present invention also offers a kind of UAC.
See the structural representation that Fig. 5, Fig. 5 are embodiment of the present invention UAC, this UAC comprises: early media negotiation unit 501, Early media selected cell 502; Wherein,
Early media negotiation unit 501, for completing the early media negotiation with arbitrary subscriber proxy server UAS in bifurcation call;
Early media selected cell 502, for media negotiation unit 501 in early days complete with the early media negotiation of arbitrary UAS in bifurcation call after, if selected other UAS as Early media transmit leg, then notify that described arbitrary UAS stops sending Early media and keeping medium property constant.
This UAC also comprises: Early media receiving element 503;
Described Early media selected cell 502 in early days media negotiation unit 501 complete with the early media negotiation of UAS arbitrary described in bifurcation call after, be further used for: if not yet select Early media transmit leg, then select described arbitrary UAS as Early media transmit leg;
Described Early media receiving element 503, for receiving the Early media that Early media transmit leg sends.
Preferably,
Described Early media selected cell 502 is after determining not yet to select Early media transmit leg, select described arbitrary UAS as before Early media transmit leg, be further used for: judge whether described arbitrary UAS meets the sender-selected rule of default Early media, if, then select described arbitrary UAS as Early media transmit leg, otherwise, notify that described arbitrary UAS stops sending Early media and keeping medium property constant.
In actual applications, described Early media selected cell 502 complete with the early media negotiation calling out arbitrary UAS in bifurcated after, can also be further used for: carry out one or many media re-negotiation with described arbitrary UAS.
Described Early media selected cell 502 when notifying that described arbitrary UAS stops sending Early media and keeping medium property constant, for: send to carry to described arbitrary UAS and stop sending Early media mark and asking with the renewal UPDATE of the successful SDP information of described arbitrary UAS current negotiation.
When described Early media selected cell 502 carries and stops sending Early media mark in described UPDATE, for: the Session initiation protocol SIP header field that increase by is new in described UPDATE: Content-Disposition:early-session-inative.
Present invention also offers a kind of UAS.
Participate in the structural representation that Fig. 6, Fig. 6 are embodiment of the present invention UAS, this UAS comprises: early media negotiation unit 601, notice receiving element 602, Early media transmitting element 603, wherein;
Early media negotiation unit 601, for completing the early media negotiation with User Agent Client UAC;
Notice receiving element 602, for media negotiation unit 601 in early days complete with the early media negotiation of described UAC after, if the stopping receiving described UAC sends Early media and the notice keeping medium property constant, then notify that Early media transmitting element 603 stops sending Early media, and keep the medium property of self constant.
Described notice receiving element 602 in early days media negotiation unit 601 complete with the early media negotiation of described UAC after, be further used for: if the stopping not receiving described UAC sends Early media and the notice keeping medium property constant, then notify that Early media transmitting element 603 sends Early media to described UAC.
In actual applications, described early media negotiation unit 601, complete with the early media negotiation of described UAC after, can also be further used for: carry out one or many media re-negotiation with described UAS.
Described stopping sends Early media and the notice keeping medium property constant stops sending Early media mark and asking with the UPDATE of the successful Session Description Protocol SDP information of described UAC current negotiation for carrying.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (15)
1. a method for branching call under gateway mode, is characterized in that, the method comprises:
User Agent Client UAC complete with the early media negotiation of arbitrary subscriber proxy server UAS in bifurcation call after, if selected other UAS as Early media transmit leg, then notify that described arbitrary UAS stops sending Early media and keeping medium property constant;
Described arbitrary UAS receives the described notice that described UAC sends, then stop sending Early media and keeping the medium property of self constant according to described notice.
2. the method for branching call under gateway mode according to claim 1, is characterized in that,
UAC complete with the early media negotiation of UAS arbitrary described in bifurcation call after, comprise further: if not yet select media transmit leg in the early time, then select described arbitrary UAS as Early media transmit leg, receive the Early media sent from described arbitrary UAS.
3. the method for branching call under gateway mode according to claim 2, is characterized in that,
After determining not yet to select Early media transmit leg, select described arbitrary UAS as before Early media transmit leg, comprise further: judge whether described arbitrary UAS meets the sender-selected rule of default Early media, if, then select described arbitrary UAS as Early media transmit leg, otherwise, notify that described arbitrary UAS stops sending Early media and keeping medium property constant.
4. the method for branching call under gateway mode according to claim 1, is characterized in that,
Described UAC complete with the early media negotiation of UAS arbitrary described in bifurcation call after, comprise further: carry out one or many media re-negotiation with described arbitrary UAS.
5. the method for the branching call under gateway mode according to the arbitrary claim of claim 1-4, is characterized in that,
Described arbitrary UAS does not receive and stops sending Early media and the notice keeping medium property constant, then send Early media to described UAC.
6. the method for the branching call under gateway mode according to the arbitrary claim of claim 1-4, is characterized in that,
Notify that described arbitrary UAS stops sending Early media and the method keeping medium property constant is: send to described arbitrary UAS and carry stopping transmission Early media mark and ask with the renewal UPDATE of the successful Session Description Protocol SDP information of described arbitrary UAS current negotiation.
7. a User Agent Client UAC, is characterized in that, this UAC comprises: early media negotiation unit, Early media selected cell;
Described early media negotiation unit, for completing the early media negotiation with arbitrary subscriber proxy server UAS in bifurcation call;
Described Early media selected cell, for media negotiation unit in early days complete with the early media negotiation of UAS arbitrary described in bifurcation call after, if selected other UAS as Early media transmit leg, then notify that described arbitrary UAS stops sending Early media and keeping medium property constant.
8. UAC according to claim 7, is characterized in that, this UAC also comprises: Early media receiving element;
Described Early media selected cell in early days media negotiation unit complete with the early media negotiation of UAS arbitrary described in bifurcation call after, be further used for: if not yet select Early media transmit leg, then select described arbitrary UAS as Early media transmit leg;
Described Early media receiving element, for receiving the Early media that Early media transmit leg sends.
9. UAC according to claim 8, is characterized in that,
Described Early media selected cell is after determining not yet to select Early media transmit leg, select described arbitrary UAS as before Early media transmit leg, be further used for: judge whether described arbitrary UAS meets the sender-selected rule of default Early media, if, then select described arbitrary UAS as Early media transmit leg, otherwise, notify that described arbitrary UAS stops sending Early media and keeping medium property constant.
10. UAC according to claim 7, is characterized in that,
Described Early media selected cell complete with the early media negotiation of UAS arbitrary described in bifurcation call after, be further used for: carry out one or many media re-negotiation with described arbitrary UAS.
11. UAC according to claim arbitrary in claim 7-10, is characterized in that,
Described Early media selected cell when notifying that described arbitrary UAS stops sending Early media and keeping medium property constant, for: send to carry to described arbitrary UAS and stop sending Early media mark and asking with the renewal UPDATE of the successful Session Description Protocol SDP information of described arbitrary UAS current negotiation.
12. 1 kinds of subscriber proxy server UAS, is characterized in that, this UAS comprises: early media negotiation unit, notice receiving element, Early media transmitting element;
Described early media negotiation unit, for completing the early media negotiation with User Agent Client UAC;
Described notice receiving element, for media negotiation unit in early days complete with the early media negotiation of described UAC after, if the stopping receiving described UAC sends Early media and the notice keeping medium property constant, then notify that Early media transmitting element stops sending Early media, and keep the medium property of self constant.
13. UAS according to claim 12, is characterized in that,
Described notice receiving element in early days media negotiation unit complete with the early media negotiation of described UAC after, be further used for: if the stopping not receiving described UAC sends Early media and the notice keeping medium property constant, then notify that Early media transmitting element sends Early media to described UAC.
14. UAS according to claim 12, is characterized in that,
Described early media negotiation unit, complete with the early media negotiation of described UAC after, be further used for: carry out one or many media re-negotiation with described UAC.
15. UAS according to claim arbitrary in claim 12-14, is characterized in that,
Described stopping sends Early media and the notice keeping medium property constant stops sending Early media mark and asking with the renewal UPDATE of the successful Session Description Protocol SDP information of described UAS current negotiation for carrying.
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